Shade-holder for electric-light bulbs



W. E. SURFACE. SHADE HOLDER FOR ELECTRIC LIGHT BULBS. APPLICATION FILED JAN. 27,1916.

aukufam Wan-Mgr Patented Sept. "7, 1920.

UNITED STATMLENT orrics.

WILLIAM E. SURFACE, OF DECATUR, ILLINOIS, ASSIGNOB TO FARIES MANUFACTURING (30., 0F DECATUR, ILLINOIS, A CORPORATION OF ILLINOIS.

SHADE-HOLDER FOR ELECTRIC-LIGHT BULBS.

Application filed January 27, 1916.

To all whom it may concern lie it known that I, WILLIAM E. SURFACE, a citizen of the United States, residing at Decatur, in the county of Macon and State of Illinois, have invented a certain new and useful Improvement in Shadellolders for Electric-Light Bulbs, of which the following is a specification. 7

My invention relates to that class of devices which are designed to secure a shade to an electric light socket, and has for its object to provide means whereby the said shade-may be quickly attached to and detached from the socket, and to provide a construction which, when the shade is locked in position, will be held rigidly upon the socket, unless loosened by manual operation. Devices of this character, with which I am familiar, although they may be caused to bind the socket by friction, will become loosened by vibration or otherwise so that gravity will cause the half shade to rotate on the socket and thus send the light in the opposite direction, a result which cannot occur where my improved construction is em- .ployed.

My means of accomplishing the foregoing objects may be more readily understood by having reference to the accompanying drawings, which are hereunto annexed and are a iart of this specificatiomin which:

Figure 1 is a side elevation of my improvement mounted on an electric light socket, a portion of the shade being broken away to show the interior construction.

Fig. 2 is an end elevation, with the clamping ferrule removedQ Fig. 8 is an end elevation of the clampg ferrule.

Fig. i is a side elevation of the same.

Fig. 5 shows a modification of the manner of fastening the tapered errule hereinafter described.

Similar reference numerals refer to similar parts throughout the entire description.

is shown in the drawings, the electric light socket 5, is formed with tl e usual peripheral rib 6, adjacent its threaded end in which the electric light bulb is mounted. The ferrule 8, is provided with two inwardly extending lugs 9 and 10. This ferrule is held in position by means of a ring 11, mounted upon the inner end of the shade 7, although it is obvious that it might, if desired, be fastened directly to the shade with- Specification of Letters Patent.

Patented Sept. *7, 1920.

Serial No. 74,544.

out the use of the ring which is merely used for additional strength, and for the appearance, one method of securing it being shown in the modification illustrated in Fig. 5, in which the 'apered ferrule is formed with a peripheral flange 23, which forms a shoulder which abuts the end of the shade 20, the end 21 of the ferrule being then turned outwardly, so that the shade is held firmly between the end 21, and the peripheral flange 23, which forms the shoulder. The ferrule 8, tapers in "ardly. lVithin the tapered ferrule S, I mount a split ferrule 12, which is provided with an annular flange 13, and has a circumferential groove 1- formed adjacent one end, which is fitted to and coincides with the ribs 6, the ferrule being split to permit its spreading enough to slip over the rib. In the sides of the split f rrule are formed diagonal slots 18, the upper edge of which is provided with a plurality of ratchet teeth 19, which are adapted to engage the lugs 9, and 10, on the ferrule 8, which lugs are slanted so as to permit them to slide over the teeth in one direction, but to engage the teeth if an attempt is made to move them in the opposite direction.

The operation of the device is as follows:

The split ferrule 12, is spread sufficiently to permit it to slip over the rib 6 when the natural springiness of the metal will cause it to engage the rib and prevent it from longitudinal movement. The ferru e 8, is then placed so that the lugs 9 and 10, will register with grooves 15 and 16, which lead into the diagonal slots 18, when a slight rotary motion causes the ferrule 12 to contract and consequently compresses it against the rib 6. Qwing to the taper of the ferrule 8, there is a cons it tendency for it to push off of the split 'ierrule 12, which results in the lugs 9 and 10, being held tightly in en- L agement with the teeth 19 formed in the slots 18 thus preventing it being rotated ard manner, while the inclination s is such as to permi it to be s'ly tig itened to increase the clamping ofof the ferrule 8, upon the split ferrule 12, so that the shade is held securely in position. t is apparent that a slight longitudinal pressure on the shade will serve to disengage the lugs 9 and 10 from the teeth 19, inasmuch as I form the slots wide enough to permit the disengagement of the Circumferential lugs with ratchet teeth, until the lugs register with the slots 15 and 16, when it can be removed from the socket.

It will be apparent from the foregoing that a very slight turn, in fact less than a quarter of a turn is sufiicient to clamp the shade securely upon the socket, thus providing a simple but efficient means for accomplishing the desired result.

Having described my invention what I regard as new and desire to secure by Letters Patent is 1. The combination with an electric light socket of a tapered split ferrule having a groove formed therein, adapted to surround the annular rib on the socket, there being inclined slots in said ferrule, one edge of each slot being provided with a plurality of ratchet teeth, a ferrule, the internal walls of which are tapered to coincide with the external walls of the split ferrule, having two inwardly projecting lugs adapted to engage the said teeth, said slots being wide enough to permit the release of said lugs from engagement with the said teeth, the tendency to push off the tapered ferrule operating to hold the lugs in engagement.

2. The combination with an electric light socket of a tapered split ferrule mounted thereon having inclined slots formed therein, and grooves leading to said slots, ratchet teeth on one edge of said slots, a shade, a ferrule, the inner'wall of which is tapered to coincide with the taper of the external wall of the'split ferrule secured thereto, inwardly extending lugs formed on said tapered ferrule to engage said ratchet teeth, the tapered wall and springiness of the split ferrule tending to push the tapered ferrule ofl thereby causing said engagement. I

3. The combination with an electric light socket of expansible and contractible means mounted thereon the external Wall of said shade holding means being tapered, there being inclined slots in said means and grooves leading to said slots, ratchet teeth formed on one edge of said slots, a shade, means to secure the shade to the expansible and contractible means, the inner walls of said securing means being fitted to and coinciding with the external wall of said expansible and contractible means, a slight rotation of which causes the means mounted on the socket to clamp and hold it firmly.

4. The combination with an electric light socket of expansible and contractible shade holding means mounted thereon, the external walls of said means being tapered, there being inclined slots in said means and grooves leading to said slots, detachable means having its internal walls tapered to fit the external walls of the expansible means to compress the expansible and contractible means, means to hold said compression until manually disengaged.

5. The combination with an electric light socket of expansible and contractible shade holding means mounted thereon, there being inclined slots in said means and grooves leading to said slots, detachable means, a slight rotation of which will compress the expansible and contractible means mounted on the socket, means to hold said compression until manually disengaged.

In testimony whereof, I have signed the foregoing specification.

' WILLIAM E. SURFACE. 

